<?php

switch($option) {   
    case "add": {
            include "intro_add.php";
            $class_add_intro = "class='active'";
            break;
    }case "edit"    : {
            include "intro_edit.php";
            break;
    }case 'intro-preview': {
            include "intro_preview.php";
            break;

    }default        : {
            include "intro_list.php";
            $class_list_intro = "class='active'";
            break;
        }
}

//===============================


?>